AMD Ryzen Embedded 8645HS vs AMD Ryzen Embedded 9700X Comparison

Where Each One Wins

The recorded data places both processors at the 50th percentile among all CPUs, and neither has a benchmark score or head-to-head win count in the database. That means the use-case split must be derived from the architectural and specification records rather than measured performance results. The AMD Ryzen Embedded 8645HS is a six-core, twelve-thread mobile part built on Zen 4 with a base clock of 4.30 GHz and a boost clock of 5.00 GHz. The AMD Ryzen Embedded 9700X is an eight-core, sixteen-thread desktop part built on Zen 5 with a base clock of 3.80 GHz and a boost clock of 5.50 GHz.

The 8645HS carries a 45 W TDP and uses AMD Socket FP8, which places it in the mobile segment. The 9700X carries a 65 W TDP and uses AMD Socket AM5, which places it in the desktop segment. The 8645HS integrates a Radeon 760M graphics unit, while the 9700X integrates a generic Radeon Graphics unit. For systems where the CPU package must operate within a lower thermal envelope, the 8645HS has the advantage on paper. For systems where sustained multi-threaded throughput matters more than power limits, the 9700X has the advantage due to its two additional cores and four additional threads.

The 9700X also offers a higher boost clock by 0.50 GHz, which benefits single-threaded workloads that scale with frequency. The 8645HS counters with a higher base clock by 0.50 GHz, which helps workloads that run at sustained all-core frequencies within a constrained power budget. The database shows no benchmark wins for either part, so the use-case split relies entirely on the recorded core counts, clock speeds, TDP values, and market segments.

Architecture Differences

The two processors come from different generations and microarchitectures. The 8645HS belongs to the 8000 series and is listed under the generation "Ryzen Embedded (Zen 4 (Hawk Point))". Its codename is Hawk Point. The 9700X belongs to the 9000 series and is listed under the generation "Ryzen Embedded (Zen 5 (Granite Ridge))". Its codename is Granite Ridge. The architecture field for the 9700X is recorded as null, but the generation field explicitly identifies Zen 5.

Both are fabricated on a 4 nm process at TSMC, but the transistor counts and die sizes differ substantially. The 8645HS contains 25,000 million transistors on a 178 mm² die. The 9700X contains 8,315 million transistors on a 70.6 mm² die. The 9700X achieves a much higher transistor density per square millimeter, which reflects the newer Zen 5 design. The 8645HS has a larger die, which aligns with its integrated Radeon 760M graphics and the Hawk Point design that includes more on-die components.

Cache hierarchies differ. The 8645HS provides 64 KB of L1 per core, 1 MB of L2 per core, and 16 MB of shared L3. The 9700X provides 80 KB of L1 per core, 1 MB of L2 per core, and 32 MB of shared L3. The 9700X has double the L3 cache, which benefits workloads with large working sets that can fit in the shared cache. The 8645HS has smaller per-core L1, which may limit some latency-sensitive single-threaded operations.

Memory support is identical in type and bus width: both support DDR5 with a dual-channel memory bus and 89.6 GB/s of memory bandwidth. Both support ECC memory. PCIe connectivity differs: the 8645HS uses Gen 4 with 20 lanes (CPU only), while the 9700X uses Gen 5 with 24 lanes (CPU only). The 9700X offers newer PCIe generation and more lanes, which matters for high-bandwidth peripherals.

The 9700X has an unlocked multiplier, while the 8645HS does not. The 9700X also has a recorded part number (100-000001404E), while the 8645HS has an unknown part number. The release dates differ: the 8645HS was released on 2024-04-01, and the 9700X was released on 2025-10-06.

Head-to-Head Benchmarks

The head-to-head benchmark array in the database is empty, and the wins counters for both parts are zero. This means no direct measured comparison exists in the recorded data. However, the specification differences allow for a quantitative comparison of what each part offers.

The 9700X has 33% more cores than the 8645HS (8 versus 6) and 33% more threads (16 versus 12). In multi-threaded workloads that scale linearly with core count, the 9700X would be expected to deliver a significant advantage, though the exact percentage is not recorded. The 9700X also has a boost clock that is 0.50 GHz higher (5.50 versus 5.00), which benefits single-threaded and lightly threaded workloads.

The 8645HS has a base clock that is 0.50 GHz higher (4.30 versus 3.80). This means that under sustained all-core loads where the boost clock cannot be maintained, the 8645HS may hold a higher frequency. The TDP difference is 20 W (65 versus 45), which indicates the 9700X has a higher thermal allowance for sustained operation.

The L3 cache difference is 16 MB (32 versus 16), which doubles the shared cache capacity for the 9700X. The L1 per-core difference is 16 KB (80 versus 64), giving the 9700X a larger per-core L1. The PCIe difference is significant: Gen 5 with 24 lanes versus Gen 4 with 20 lanes. The 9700X supports newer PCIe devices and has four additional lanes.

The 8645HS has a larger die (178 mm² versus 70.6 mm²) and more transistors (25,000 million versus 8,315 million). This reflects the inclusion of the Radeon 760M iGPU and the older Zen 4 design. The 9700X has a smaller die and fewer transistors, which suggests a more efficient design per transistor.

The Verdict

The data indicates that the 9700X is the stronger processor for desktop workloads that benefit from more cores, more threads, higher boost frequency, larger L3 cache, and newer PCIe generation. The 8645HS is the appropriate choice for mobile or embedded systems where the 45 W TDP and Socket FP8 form factor are required. The 9700X targets systems with a 65 W TDP and Socket AM5, which allows for an unlocked multiplier and overclocking capability.

For single-threaded performance, the 9700X has a 0.50 GHz higher boost clock. For multi-threaded performance, the 9700X has two additional cores and four additional threads. For cache-sensitive workloads, the 9700X has double the L3 capacity. For PCIe bandwidth, the 9700X offers Gen 5 and four additional lanes. The 8645HS retains advantages in base clock (0.50 GHz higher) and integrated graphics (Radeon 760M versus generic Radeon Graphics).

Neither part has recorded benchmark scores, so the verdict is based on architectural comparison. The 9700X appears designed for maximum throughput in a desktop context. The 8645HS appears designed for power-constrained mobile or embedded use. The choice between them depends on the thermal envelope and socket requirements of the target system.

FAQ

Q: Which processor has more cores and threads?

A: The AMD Ryzen Embedded 9700X has 8 cores and 16 threads, while the AMD Ryzen Embedded 8645HS has 6 cores and 12 threads.

Q: What is the boost clock difference between the two?

A: The 9700X has a boost clock of 5.50 GHz, which is 0.50 GHz higher than the 8645HS boost clock of 5.00 GHz.

Q: Which processor has a higher base clock?

A: The 8645HS has a base clock of 4.30 GHz, which is 0.50 GHz higher than the 9700X base clock of 3.80 GHz.

Q: Do both processors support the same memory type and bandwidth?

A: Yes, both support DDR5 with a dual-channel memory bus and 89.6 GB/s memory bandwidth, and both support ECC memory.

Q: What are the TDP values for each processor?

A: The 8645HS has a TDP of 45 W, and the 9700X has a TDP of 65 W.

Q: Which processor has an unlocked multiplier?

A: The 9700X has an unlocked multiplier, while the 8645HS does not.

Specification Differences

| Specification | AMD Ryzen Embedded 8645HS | AMD Ryzen Embedded 9700X |

|----------------|---------------------------|---------------------------|

| Series | 8000 series | 9000 series |

| Cores | 6 | 8 |

| Threads | 12 | 16 |

| Base Clock | 4.30 GHz | 3.80 GHz |

| Boost Clock | 5.00 GHz | 5.50 GHz |

| TDP | 45 W | 65 W |

| Socket | AMD Socket FP8 | AMD Socket AM5 |

| Codename | Hawk Point | Granite Ridge |

| Generation | Ryzen Embedded (Zen 4 (Hawk Point)) | Ryzen Embedded (Zen 5 (Granite Ridge)) |

| Transistors | 25,000 million | 8,315 million |

| Die Size | 178 mm² | 70.6 mm² |

| L1 Cache | 64 KB (per core) | 80 KB (per core) |

| L2 Cache | 1 MB (per core) | 1 MB (per core) |

| L3 Cache | 16 MB (shared) | 32 MB (shared) |

| PCIe | Gen 4, 20 Lanes (CPU only) | Gen 5, 24 Lanes (CPU only) |

| Integrated Graphics | Radeon 760M | Radeon Graphics |

| Market Segment | Mobile | Desktop |

| Release Date | 2024-04-01 | 2025-10-06 |

| Multiplier Unlocked | false | true |

| Part Number | unknown | 100-000001404E |